Light travels slightly slower in the
A) upper atmosphere.
B) lower atmosphere.
C) neither of these
Answer: B
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Which of the following has units of momentum?
A) N-m B) kg-s/m C) kg-m2/s D) J-s/m E) kg- /
A thin-walled spherical tank has a diameter of 0.75 m and an internal pressure of 20 MPa. The yield stress in tension is 920 MPa, the yield stress in shear is 475 MPa, and the factor of safety is 2.5. The modulus of elasticity is 210 GPa, Poisson’s ratio is 0.28, and maximum normal strain is 1220 3 1026. The minimum permissible thickness of the tank is approximately:
(A) 8.6 mm
(B) 9.9 mm
(C) 10.5 mm
(D) 11.1 mm
Earth's actual diameter is about 12,800 kilometers. What is Earth's diameter in a 1-to-10 billion scale model solar system? Show your work clearly.
What will be an ideal response?
A pencil has
A. no nuclei in it. B. no electric charges in it. C. enough positive charge in the nuclei to balance the negative charge of the electrons. D. electrons that are not attracted to nuclei.